Chapter 9: Q9-16Q (page 230)
The ball at points A, B, and C is in unstable equilibrium, stable equilibrium, and neutral equilibrium, respectively.
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(II) Find the tension in the two cords shown in Fig. 9–52. Neglect the mass of the cords, and assume that the angle is 33°, and the mass m is 190 kg.
A 65.0-kg painter is on a uniform 25-kg scaffold supported from above by ropes (Fig. 9–84). There is a 4.0-kg pail of paint to one side, as shown. Can the painter walk safely to both ends of the scaffold? If not, which end(s) is dangerous, and how close to the end can he approach safely?
(I) A sign (mass 1700 kg) hangs from the bottom end of a vertical steel girder with a cross-sectional area of
(III) A uniform ladder of mass mand length leans at an angle
Two children are balanced on opposite sides of a seesaw. If one child leans inward toward the pivot point, her side will
(a) rise.
(b) fall.
(c) neither rise nor fall.
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